Haven't done Samba on HP-UX for a while. Where I last did it I never saw this. However, I imagine smbd like nfsd is configurable as to how many you need to run. With nfsd you determine how many daemons to start by how many clients you expect to have using the share. If its only a couple then 4 would be plenty. If you have thousands then you may need a lot more.
FYI: Not a lot of HP-UX traffic on this forum. You might try HP's official support forums (itrc.hp.com) or the Dutchworks mailing list.
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